4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver


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The RT9378 is a 4 CH WLED driver with auto mode selection of x1, x1.5 and x2 mode with low dropout voltage in current sources. The RT9378 can power up to 4 white LEDs with regulated constant current for uniform intensity. Each channel (LED1 to LED4) can support up to 25mA. The part maintains highest efficiency by utilizing x1/x1.5/x2 fractional charge pump and low dropout current regulators. For the brightness control, user can easily use a PWM signal generated from GPIO to control the brightness of WLEDs.

The RT9378 is available in a WQFN-12L 2x2 package. Small 0.22μF capacitors can be used for fly capacitors. It provides the best backlighting solution with high efficiency and smallest board space for portable application.


  • Camera Phone, Smart Phone
  • White LED Backlighting
Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 4.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 4
Iout (max)/channel (mA) 25
Iq (typ) (mA) 1
Dimming Control PWM
Topology Charge Pump
Features 100% Duty Cycle;Enable Input;OVP;SCP;Stable with Ceramic Capacitor;UVP
Package Type WQFN2x2-12
  • Efficiency Up to 93% Over Li-ion Battery Discharge
  • Typical 85% Average Efficiency Over Li-ion Battery Discharge
  • Support Up to 4 White LEDs
  • Support Up to 25mA/Per Channel
  • Support Up to 100mA Output Current
  • PWM Brightness Control
  • 60mV Typical Current Source Dropout
  • 1% Typical LED Current Accuracy
  • 0.7% Typical LED Current Matching
  • Automatic x1/x1.5/x2 Charge Pump Mode Transition
  • Low Input Noise and EMI Charge Pump
  • 5V Over Voltage Protection
  • Power On/Mode Transition In-rush Protection
  • 1MHz Switching Frequency
  • 0.4μA Low Shutdown Current
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver2009/01/05
Title Last Update ShareDownload
4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver 2015/05/19